2019AJ....157..236Y -
Astron. J., 157, 236-236 (2019/June-0)
Exploring reionization-era quasars. IV. Discovery of six new z >= 6.5 quasars with DES, VHS, and unWISE photometry.
YANG J., WANG F., FAN X., YUE M., WU X.-B., LI J.-T., BIAN F., JIANG L., BANADOS E. and BELETSKY Y.
Abstract (from CDS):
This is the fourth paper in a series of publications aiming at discovering quasars at the epoch of reionization. In this paper, we expand our search for z ∼ 7 quasars to the footprint of the Dark Energy Survey (DES) Data Release One (DR1), covering ∼5000 deg2 of a new area. We select z ∼ 7 quasar candidates using deep optical, near-infrared (near-IR) and mid-infrared (mid-IR) photometric data from the DES DR1, the VISTA Hemisphere Survey, the VISTA Kilo-degree Infrared Galaxy survey, the UKIRT InfraRed Deep Sky Surveys-Large Area Survey (ULAS), and the unblurred coadds from the Wide-field Infrared Survey Explore (WISE) images (unWISE). The inclusion of DES and unWISE photometry allows the search to reach ∼1 mag fainter, comparing to our z >= 6.5 quasar survey in the northern sky. We report the initial discovery and spectroscopic confirmation of six new luminous quasars at z > 6.4, including an object at z = 7.02, the fourth quasar yet known at z > 7, from a small fraction of candidates observed thus far. Based on the recent measurement of z ∼ 6.7 quasar luminosity function using the quasar sample from our survey in the northern sky, we estimate that there will be >=55 quasars at z > 6.5 at M1450 < -24.5 in the full DES footprint.
Abstract Copyright:
© 2019. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: active - galaxies: high-redshift - quasars: emission lines
Simbad objects:
11
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